<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        body{
            background:url(th.jpg);
        }
        .one{
    height: 90px;
    width: 1535px;
    background-color: #0eb189;
    margin: auto;
}
.one img{
    margin-top: 20px;
    margin-left: 200px;
}
.two img{
    float: left;
    height: 260px;
    width: 260px;
    margin-left: 250px;
    margin-top: 20px;
 }
 .qqq h2{ 
    margin-left: 280px;
    margin-top: 120px;
    color: #fff;
} 
.ppp h2{ 
    margin-left: 1020px;
    margin-top: -30px;
    color: #fff;
} 
.three img{
    float:right;
    margin-right: 250px;
    margin-top: 20px;
}
.www{
    height: 70px;
        width: 1535px;
        background-color:black;
        margin-top: 450px;
        color: #fff;
}
.nnn{
        height: 46px;
        width: 240px;
        float: left;
        margin-left: -250px;
        margin-top: 300px;
        border-bottom-left-radius: 15px;
        border-top-left-radius: 15px; 
        border-bottom-right-radius: 15px;
        border-top-right-radius: 15px; 
        text-align: center;
        background-color:#fff;
        color: #0eb189;
        text-decoration: none;
}
.ooo{
        height: 46px;
        width: 240px;
        float: right;
        margin-right: -250px;
        margin-top: 300px;
        border-bottom-left-radius: 15px;
        border-top-left-radius: 15px; 
        border-bottom-right-radius: 15px;
        border-top-right-radius: 15px; 
        text-align: center;
        background-color:#0eb189;
        color: #fff;
        text-decoration: none;
}
a{
    text-decoration: none;
    color: #fff;
}
.nnn a{
    color: #0eb189;
}

    </style>
</head>
<body>
    <div class="one">
        <img src="654.jpg" alt="">
    </div>
    <div class="qqq">
        <h2>教学、学习好帮手</h2>
    </div>
    <div class="two">
        <img src="789.png" alt="">
    </div>
    <div class="ppp">
        <h2>下载运行 轻松投屏</h2>
        </div> 
    <div class="three">
        <img src="879.png" alt="">
    </div>
    <div class="nnn">
        <a href="#"><h4>扫码下载手机端</h4></a>
    </div>
    <div class="ooo">
       <a href="#"><h4>下载投屏电脑端</h4></a>
    </div>
    <div class="www">

    </div>
    <div *></div>
    
</body>
</html>